산업현장에서 쉽게 적용할 수 있는 근본원인 사고조사기법 개발에 관한 연구

권재범,권영국,Kwon, Jae Beom,Kwon, Young Guk 한국안전학회 2021 한국안전학회지 Vol.36 No.5

Incident investigation is one of the most important processes among various other safety management methods to prevent industrial accidents. Finding the root causes of accidents, eliminating hazards, and improving safety are the most important purposes of investigating accidents. During the investigation process, root cause analysis (RCA) techniques are used to effectively identify RCA. Over the past few decades, over 30 RCA methods have been developed. These techniques are being widely used in some industries, such as the nuclear and aircraft industries; however, most of the RCA techniques require professional knowledge and special training, making it difficult for safety managers in their respective fields to understand and apply them. Therefore, managers of general industrial sites are rarely present at the scene of actual accident investigations, and they cannot contribute much to the purpose and effectiveness of these investigations. In this study, to address these issues, we developed an RCA technique to facilitate root cause investigation of accidents in real-world industrial sites. To develop new techniques, Systematic Cause Analysis Technique (SCAT), one of the RCA techniques, was used to investigate incidents in the enterprise over three years. We also utilized feature analysis and other papers from existing RCA techniques. To verify its effectiveness, the technique proposed was also applied to the accident case. The technique developed can easily identify and analyze the root cause of an accident and help industrial managers. It can also identify the root cause category where accidents are concentrated and use this data to establish guidelines for preventing future accidents and, thus, focus on prioritizing improvement initiatives.

한국 산업계에서 사고조사 수행 시 사고조사자의 관점에 관한 연구

권재범,권영국,Kwon, Jae Beom,Kwon, Young Guk 한국안전학회 2021 한국안전학회지 Vol.36 No.2

Incident investigation is regarded as a means to improve safety performance. For the prevention of industrial accidents, measures such as providing safety education, enhancing management interest and participation, establishing a safety management system, and conducting inspection of the work site are necessary. In particular, accident investigation activities, which are an important element of safety management, help to prevent similar accidents, thereby minimizing damage and enhancing work safety. They are critical for understanding business-related incidents and the vulnerabilities and opportunities associated with them. Therefore, it is clear that accident investigation activities are important for accident prevention. The primary focus of many incident investigation processes is on identifying the cause of an event. While considerable research has been conducted on potential accident investigation tools there has been little research on including the views and experiences of practitioners in the accident investigation process. In this study, a questionnaire survey was conducted among safety managers in the domestic manufacturing/construction industry to understand the practice of accident investigation. The investigation pertained to companies' accident investigation systems, the competence of investigators, and the identification and recommendations of the cause of accidents. From the analysis results of accident investigations, investigators' competence, the difficulty level of investigations, and the root causes of accidents were identified from the viewpoint of the participants of the accident investigations. In particular, the development of standardized and simple accident investigation methods and their dissemination to companies were found to be necessary for activating the root cause of accidents. Based on this, it can be used as basic data for the development of root cause analysis investigation techniques that are easily applicable to organizations.

베트남과 아시아-태평양지역 국가 간 전략적 파트너십 확대 연구: 중국의 부상에 대한 베트남의 대응 측면을 중심으로

권재범(Kwon, Jaebeom) 한국동북아학회 2020 한국동북아논총 Vol.25 No.3

최근 국제정치질서에서 힘의 균형상태에 심각한 변화를 가하고 있는 요인으로 중국의 부상을 들 수 있다. 그리고 중국은 경제적 성장을 바탕으로 군사력 확장에 심혈을 기울이고 있으며, 다양한 이슈 영역에서 적극적이고 다소 공격적인 모습을 보이고 있다. 이러한 상황 속에서 중국과 국경을 접하고 있으며, 남중국해 분쟁의 당사국인 베트남의 대중국 전략은 어떤 모습을 취하고 있는가? 본 연구는 2010년 이후 해양분쟁 문제에 있어 중국의 강압행위가 증가함에 따라 베트남이 어떻게 대처하고 있는지를 살펴보고자 한다. 본 연구는 베트남과 주변 국가들과의 전략적 파트너십 사례들을 분석하였으며, 그 결과 베트남은 대중국 헤징전략 속에서도 대중 ‘균형’전략을 강화하고 있다고 주장한다. 특히 2010년대 들어 베트남과 아시아-태평양 지역 주요 국가들 – 일본, 인도, 호주 – 간의 전략적 파트너십이 다변화, 확대되고 있으며, 이는 현재 베트남의 대중국 헤징 전략 속에서 중국에 대한 견제전략 요소가 증가하고 있음을 보여준다. The rise of China has been an important factor changing the balance of power system on the international stage. China has attempted to enhance its military power based on its economic strength, and has taken active, even assertive, behaviors in various issue areas. Under these circumstances, the response of Vietnam which shares a land border and competes with China over the South China Sea issue, has attracted attention. As many studies have pointed out, Vietnam’s China policy can be categorized as a hedging strategy. However, this study argues that, facing China’s growing assertiveness since the 2010s, Vietnam has increased its balancing elements in its hedging strategy. Specifically during the 2010s, Vietnam has been diversifying and expanding its strategic partnerships with major Asian-Pacific countries, such as Japan, India, and Australia, showing that Vietnam’s hedging strategy is moving toward ‘balancing’ on the spectrum between balancing and bandwagoning.

다중벽 탄소나노튜브가 포함된 전기 전도성 아크릴계 점착제의 유화 중합 및 그 물성

권재범(Jaebeom Kwon),박성환(Seonghwan Park),김성훈(Sunghoon Kim),조지은(Jieun Jo),한창우(Changwoo Han),박경태(Kyungtae Park),하기룡(KiRyong Ha) 한국고분자학회 2015 폴리머 Vol.39 No.4

본 연구에서는 개질된 다중벽 탄소나노튜브(MWCNTs)를 충전제로 사용하여 전기 전도성 아크릴계 점착제 제조에 관한 연구를 수행하였다. 황산:질산(3:1 v/v)의 혼산을 사용하여 MWCNTs 표면에 카르복시기를 도입 후, SOCl2와 1,4-butanediol(BD)를 반응시켜 MWCNT-OH를 제조하였다. 제조된 MWCNT-OH에 3-methacryloxypropyltrimethoxylsilane(MPTMS)를 반응시켜 methacrylate기를 도입하였다. 표면 개질된 MWCNT, 2-ethylhexyl acrylate(2-EHA), n-butyl acrylate(n-BA), methyl methacrylate(MMA)와 acrylic acid(AAc)를 단량체로 하여 유화중합법으로 아크릴 점착제를 제조하였다. MWCNT-MPTMS의 함량이 0~0.5 wt%로 증가할수록, 점도, 박리강도 및 점착력은 증가하고, 면 저항값은 낮아지는 것을 확인하였다. In this study, multi-walled carbon nanotubes (MWCNTs) were oxidized with a mixture of H2SO4:HNO3(3:1 v/v). After oxidation, oxidized MWCNTs were treated with thionyl chloride (SOCl2) and 1,4-butanediol (BD) in sequence at room temperature to introduce hydroxyl groups on the surface of MWCNTs. The prepared MWCNT-OH was silanized with 3-methacryloxypropyltrimethoxylsilane (MPTMS), to introduce polymerizable methacrylate groups to make MWCNT-MPTMS. MWCNT-MPTMS was used for the emulsion polymerization of 2-ethylhexyl acrylate (2-EHA), nbutyl acrylate (n-BA), methyl methacrylate (MMA), and acrylic acid (AAc) as monomers to prepare electrically conductive acrylic pressure-sensitive adhesive (EPSA). We found increase of Tg, viscosity, peel strength and tack and decrease of sheet resistivity with increase of MWCNT-MPTMS contents in EPSA from 0 to 0.5 wt%.

중국의 해양수송로 안보전략과 안보딜레마의 심화: 인도양 지역을 중심으로

권재범 ( Jaebeom Kwon ) 한국외국어대학교 글로벌정치연구소 2020 글로벌정치연구 Vol.13 No.2

현재 강력한 경제력을 바탕으로 아시아 지역의 강대국을 넘어 국제무대에서의 영향력을 확대하고 있는 중국에게 있어 에너지 자원의 안정적인 수급은 자국의 지속적인 경제성장을 위해 무엇보다도 중요한 과업이다. 그리고 이를 위해 중국은 해양에너지 수송의 안전 확보를 위해 사활적인 노력을 진행 중이다. 그러나 이러한 중국의 해양수송로 안보전략은 다른 국가들에게 위협의 요인으로 작용할 수 있으며, 지역 질서에도 의도하지 않은 부정적인 영향을 끼칠 수 있다. 본 연구는 과연 중국의 해양수송로 안보전략이 지역질서에 어떠한 영향을 미치고 있는지를 분석한다. 이를 위해 인도양 지역에서 추진 중인 중국의 해양수송로 안보전략을 살펴보고, 이러한 중국의 행위가 인도양의 다른 주요 국가인 인도의 안보 우려를 야기하며, 결국 이 지역에서의 안보딜레마의 심화로 이어지고 있다고 주장한다. For China, which has attempted to expand its economic influences beyond Asia, securing an energy supply is one of the most fundamental tasks for its sustainable economic prosperity. For this reason, China is striving to ensure safety for energy transportation in the maritime domain. However, this endeavor can be a threat to other countries, and can have a negative impact on regional order. This study aims to analyze how China’s strategies for its maritime energy security has had an impact on Asian security. For this purpose, this study examines China’s efforts to stabilize its maritime energy security in the Indian Ocean, and argues that China’s behaviors in the Indian Ocean region arouse security concerns from India, which is another major actor, and consequently, intensify the security dilemma there.

알칼리 가용수지를 고분자 유화제로 사용한 아크릴계 점착제의 유화중합 및 그 물성

권재범(Jaebeom Kwon),박성환(Seonghwan Park),김성훈(Sunghoon Kim),조지은(Jieun Jo),한창우(Changwoo Han),박경태(Kyungtae Park),하기룡(KiRyong Ha) 한국고분자학회 2016 폴리머 Vol.40 No.1

최근 용제형 대신 수계형 점착제의 수요가 증가하고 있지만, 유화중합 후 잔류하는 저분자 유화제가 점착제 코팅 표면으로 전이되어 내수성과 점착 강도를 저하시키는 문제점들이 있다. 본 연구에서는 이러한 단점들을 극복하기 위하여 큰 분자 구조로 인해 이동 속도가 낮은 고분자 유화제인 알칼리 가용수지(alkali-soluble resin, ASR)를 사용하여 2-EHA, n-BA, MMA와 AAc를 단량체로 사용한 점착제를 중합하였다. 또한 저분자 유화제인 sodium dodecyl sulfate(SDS)와 Triton X-114을 질량비 3:2로 혼용하여 점착제를 중합하여 물성을 서로 비교하였다. 합성된 점착제들을 항온(85 ℃)/항습(상대습도 85%) 조건에서 숙성시간에 따른 박리강도, 초기 점착력 및 유지력 변화를 측정한 결과 고분자 유화제로 제조된 점착제는 위 물성들의 경시변화가 거의 없고 평균 분자량과 평균 입도는 저분자 유화제로 제조된 점착제보다 각각 2.8배와 15배 높아졌다. There has been a growing demand on aqueous-type adhesives due to environmental concerns for solvent-type adhesives. However, low molecular weight emulsifiers remaining after polymerization can be transferred to the adhesive coating surface lowering water-resistance and adhesive strength of adhesives for emulsion polymerized aqueous-type adhesives. To overcome these disadvantages, we used alkali-soluble resin (ASR), which had a lower migration rate due to large molecular structure of ASR to polymerize 2-EHA, n-BA, MMA and AAc as monomers to make a pressure sensitive adhesive (PSA). We measured the change of peel strength, initial tack and holding power of PSA according to aging time at constant temperature/humidity (85 ℃/85%) conditions. We found almost no change in the time variation of the above physical properties of PSA prepared with ASR. We also confirmed that 15 times larger average particle size and 2.8 times higher molecular weight for the PSA made with ASR than the one made with low molecular weight emulsifiers.

미국의 반중국 안보네트워크와 중국의 대응 : 태국을 겨냥한 중국의 쐐기전략 분석

권재범(Kwon, Jaebeom) 고려대학교 아세아문제연구소 2021 亞細亞硏究 Vol.64 No.2

안드로이드 기반의 이미지 퍼즐 게임 어플리케이션

권재범 ( Jae-bom Kwon ),홍민 ( Min Hong ) 한국정보처리학회 2011 한국정보처리학회 학술대회논문집 Vol.18 No.2

최근 스마트폰과 관련한 게임 어플리케이션들이 여가시간이나 자투리 시간 활용에 폭발적인 인기를 누리고 있다. 본 논문은 이러한 환경에서 스마트폰을 이용하여 남, 여 연예인 사진을 가지고 이미지 퍼즐을 풀어 유명 연예인의 사진을 맞추는 이미지 퍼즐 게임을 안드로이드 기반으로 구현하였다. 본 연구에서 개발된 스마트폰 어플리케이션은 스마트폰이 대중화 된 무선 인터넷 시대에서 모든 스마트폰 사용자들이 여가시간을 즐겁게 활용할 수 있도록 설계 및 구현되었다.

실란화 반응으로 표면 개질된 다중벽 탄소나노튜브(MWCNTs)와 Methyl Methacrylate의 유화중합을 통한 MWCNTs/Poly(methyl methacrylate) 복합 입자 제조 및 그 형태학적 특성

권재범(Jaebeom Kwon),박성환(Seonghwan Park),김성훈(Sunghoon Kim),조지은(Jieun Jo),한창우(Changwoo Han),하기룡(KiRyong Ha) 한국고분자학회 2015 폴리머 Vol.39 No.2

본 연구에서는 다중벽 탄소나노튜브(MWCNTs)를 질산과 황산의 혼산으로 산화시켜 표면에 카르복시기를 도입 후, SOCl2와 1,4-butanediol을 사용하여 MWCNT-OH를 제조하였다. 제조된 MWCNT-OH는 3-methacryloxypropyltrimethoxylsilane(MPTMS)와 실란화 반응으로 methacrylate기가 도입된 MWCNT-MPTMS를 제조하였다. MWCNT-MPTMS와 methyl methacrylate(MMA)를 사용하여 유화중합법으로 MWCNT-MPTMS/PMMA 복합 입자를 제조하였다. 음이온 계면 활성제인 sodium dodecylbenzene sulfonate(SDBS)를 사용하여 유화중합한 MWCNTMPTMS/PMMA는 균일한 입도, 좁은 입도분포 및 계면에서의 화학결합으로 인하여 Tg가 순수 MWCNT를 사용하여 중합한 시료보다 3.4℃ 높아짐을 확인하였다. In this study, multi-walled carbon nanotubes (MWCNTs) were oxidized with a mixture of nitric acid and sulfuric acid. After oxidation, oxidized MWCNTs were treated with thionyl chloride (SOCl2) and 1,4-butanediol (BD) in sequence at room temperature to introduce hydroxyl groups on the surface of MWCNTs. The prepared MWCNT-OH was silanized with 3-methacryloxypropyltrimethoxylsilane (MPTMS) to make MWCNT-MPTMS. The MWCNT-MPTMS was used as fillers in emulsion polymerization to make MWCNT-MPTMS/PMMA composite particles with 3 kinds of emulsifiers, hexadecyltrimethylammoniumbromide (CTAB) as a cationic, sodium dodecylbenzene sulfonate (SDBS) as an anionic and polyethylene glycol tert-octylphenyl ether (Triton X-114) as a nonionic emulsifier. Morphologies of composite emulsions were confirmed by a particle size analyzer (PSA) and a scanning electron microscope (SEM). Morphologies of emulsion polymerized MWCNT-MPTMS/PMMA with SDBS showed more uniform particle size distribution compared to those of other two emulsifiers used emulsions. MWCNT-MPTMS/PMMA showed 3.4℃ higher Tg compared to pristine MWCNT/PMMA due to covalent bond formation at interface of MWCNT-MPTMS and PMMA.

초고층 건축공사의 생산성 향상을 위한 Jump Point Search 기반 작업층 자재배치 최적화 모델

권재범 ( Jaebeom Kwon ),김태훈 ( Taehoon Kim ),강경인 ( Kyung-in Kang ) 조선대학교 공학기술연구원 2016 공학기술논문지 Vol.9 No.2

In tall building construction, time for transporting materials on a floor is one of the factors which largely affect work productivity. Thus, the necessity of optimizing the floor-level layout plan has increased, and path finding algorithms to find an optimal path by considering various obstacles have been required to provide a more reliable floor-level layout planning. Jump point search (JPS) algorithm has high accuracy of optimal paths through global search by minimizing the computational problem, compared to heuristic search algorithms that find paths at the moderate level to reduce the computational time and effort. Therefore, this study proposes a floor-level layout planning model for tall building construction based on optimal path finding by the JPS algorithm. The applicability of the JPS algorithm to the construction field was verified by increasing work productivity of the floor-level layout planning of the heuristic search by approximately 14%. The proposed path finding algorithm will contribute to preparing a more reliable construction layout planning model.